14:05 Vettel improves to a 1m24.748s, which keeps him second, just behind Bottas.
14:04 Bottas returns to the pits having just gone fastest again with a 1m24.654s in the Mercedes. Vettel stays out.
14:02 A 1m24.953s moves Vettel to the top. Just Ferrari and Mercedes circulating at the moment, but both are getting some early laps in to make a solid start to 2017 testing.

14:08 Vettel pits again, so the track falls quiet.
14:07 P1 for Vettel with a 1m24.509s, which moves him ahead of the time Bottas set before taking the Mercedes back to the pits. The Ferrari is already up to 8 laps for the day, and he improves again to 1m23.509s next time by.